Is this reasonable for an addition?

I am planning to put in an addition: add 3 bedrooms and 1 bathroom on each floor (about 450 sq./FL) to a very old two family house. The best quote is about $75,000. The contractor is asking for 1/3 down after the permit is approved by the township before breaking the ground. Is this reasonable?  Is there anything I should be worried about?

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• what is the total SF? -tianfangye- ♂ (0 bytes) () 10/24/2012 postreply 13:30:33

• 回复：what is the total SF? -美眉168- ♀ (37 bytes) () 10/24/2012 postreply 13:32:51

• You might be a general contractor for the project. -tianfangye- ♂ (79 bytes) () 10/24/2012 postreply 13:36:43

• 回复：You might be a general contractor for the project. -美眉168- ♀ (178 bytes) () 10/24/2012 postreply 13:41:04

• I see。。。 -tianfangye- ♂ (0 bytes) () 10/24/2012 postreply 14:28:16